This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 25 |
| 5 | 80 |
| 6 | 291 |
| 7 | 1036 |
| 8 | 3875 |
| 9 | 14561 |
| 10 | 55624 |
| 11 | 213951 |
| 12 | 830712 |
| 13 | 3244355 |
| 14 | 12747718 |
| 15 | 50320659 |
| 16 | 199491045 |
| 17 | 793754027 |
| 18 | 3168756843 |
| 19 | 12687184463 |
| 20 | 50932363171 |